Strainer



JuneA 28, 1927- E. M. sc:ov|| EA STRAINER 2 Sheets-Sheet 1 Filed Sept.13, 1924 I lNvE-x-tm- En@v l l ATTmRNE\/.

'ET E- Patented June 28, 1927.

i 1.634.086 PATENT OFFICE.

EUGENE M. S-COVILLE, vCEI? MILWAUKEE, WISCNS'IN, ASSIGNOB 0F ONE-BALI'T0 FLOYD I L. SWANBEBG, 0F PITTSBURGH, PENNSYLVANIA.

STRAINER.

Application tiled September 13, 1924. Serial No. 737,633.

This invention relates in general to improvements in the art ofseparating solids from fluids, and relates more specifically toimprovements in the construction and operation of strainers for removingnormally insoluble solid particles from liquid in which such particles`are carried in suspension.

Generally stated; an object of the invention is to provide an improvedvstrainer which is simple in construction .and efficient in operation.

Other more specific objects and advantages of the invention are asfollows To provide improvements in the construction of strainers inwhich a fluid jacket is employed to control the temperature of thesubstance which is being purified.

To provide an improved purifying device of the typein which thefiltering medium may be cleaned without interrupting .the

operation of the device.

To provide an improved' multi-compartment strainer comprising aplurality of independently functioning separating compartments any ofwhich may be operated or shut down, as desired. J

To provide amulti-unit purifier in which the several units areaccessible only'wlien disconnected from the impure fluid supply line.

To provide a compact strainer of relatively large capacity,

all parts of which are convenientlyaccessible for ins ection and whichmay be readily assemble and dismantled.

- To provide a durable strainer structure in which the various elementscan be assem-l bled only in correct relation to each other, and in whichstandard'machine elements are utilized wherever possible.

40' To provide a purifying mechanism for liquids, in which undesirablepocketing of air is effectively prevented and in which leakage of liquidis positively eliminated.

To provide a strainer whichpis especially adapted for the automaticpurification of oil in lubricating systems.

To provide improved `distributing valve mechanism for strainers .andother fluid distribution systems.

.structures and seatings stherefor whereby tight closing of such valvesis assured.

To provide various other improvements in the details of construction ofstrainers To provide improvements in rotary valveV and liquid purifyingapparatus whereby the cost of manufacture of such evices is reduced to aminimum and the elliciency of operation is enhanced to a maximum.

These and additional objects .and advantages attainable with the presentimprovement, will be apparent in the course of the followingdescription.

A clear conception of anembodiment of the invention and of the operationof devices 'constructed in Vaccordance therewith, maybe had by referringto the drawings accompanying and forming a part of this specification inwhich likereference characters designate the same or similar parts inthe various views. .l

Fig. 1 is a part sectional top view of an improved duplex liquidstrainer.

Fig. 2 is a transverse central vertical section through the improvedduplex liquid strainer. Y

Fig. 3 is a part sectional front elevation of the improved duplex liquidstrainer.

Fig. 4 is a fragmentary horizontal section through the inner casing ofthe improved duplex liquid strainer.

Fig. v5 is a top view of the distributing valve of the improved duplexliquid strainer. Fig. 6 is Aa side view-of the distributing valve of theimproved duplex liquid strainer.

The improved duplex liquid strainer specifically illustrated in thedrawings is especially adapted foi` the purification of lubricating oiland comprises in general an outer casing 2 having an open upper end; anin-` ner casing 3 providing a closure for the upper open end of theouter casing 2 and cooperatin therewith to form ailuid jacket 30; a pairof independently functioning filtering screensA 6 inclosed within theinner casing 3 by means of` independently removable covers 28; a rotarydistributin valve 4 for controlling the flow ofl liqui to and from thefiltering screens 6; a main liquid inlet p ipe 7 connected to the casing3 for supplying impure liquid to the strainer; a

noA

main liquid outlet pipe 8 connected to the Y easing 3 for dischargingpurified liquid from the strainer; and mechanism for manipulating thedistributing valve 4.

The outer casing'Q-is provided near the bottom of one end with a fluidinlet 31 communicating with the jacket 30, and is also provided near thetop of the opposite end also providedwith a drain 43 which is normallyclosed by means of a removable plug as shown in Fig. 2.

r1`he inner casing 3 comprises a pair of integrally united cups 25 eachvof which is divided by a horizontal partition 26 and the 1 screen 6cooperating therewith, into an upper impure liquid compartment 27 and alower purified liquid compartment 24. The inner casing 3 is completelysurrounded by the luid jacket 30, and is detachably secured to the outercasing 2 by means of studs 29 and nuts 39 which clamp the casings 2, 3against an intervening packing 36.

Each of the filtering screens 6 is removably supported upon an adjacentpartition 26, and comprises concentric tubular screens of differentdiameters the lower ends of which are connected by a spacing plate andthe upper end of the inner of which is closed by a top plate. The covers28 are detachably secured to the inner casing 3 above the several cups25, by means of standard clamps 35 and nuts 40. The joints between thecovers 28 and the casing 3 are sealed against leakage by means ofpackings 37, and a helical spring 38 coactingwith each cover 28 and withthe top plate of an adjacent screen 6, serves to positively hold thescreen in proper position. The covers 28 are of sufficient size -topermit free vertical removal of the screens 6 upon release of the clamps35 and removal ot the covers.

The common distributing valve 4 of the two strainers is rotatablymounted in a ported seating bushing 5 which is pressed into a centralbore,47 of the inner casing 3. The

bore 47 communicates at its upper end directly with the inlet pipe 7 andat its lower end with a discharge passage 23 leading to the outlet pipe8. The bushing 5 has oppositely disposed upper and lower ports, theupper of which communicate with the impure strainer compartments 27through passages 10, 11, and the lower of which communicate with thepure liquid strainer compartments 24 through passages 12, 13. Thehighest portion of the inlet conduit is provided with a standardradiator air vent 44 and the casing 3 is provided with a thermometeropening 49 located in line with the passage 23.

The rotary controly valve 4 is snugly fitted within the bore 'of thebushing 5 and is divided into upper and lower chambers 19, 20respectively, by means of an imperforate horizontal part-it-ion. Thewall ot the valve 4 surrounding the upper chamber 19 is penetrated byoppositely disposed side ports 21 the liquid.

past the screens 6 into the lower compartand an intermediate port 15;and the wall surrounding the lower chamber 20 is penetrated byoppositely disposed side ports 22 and an .intermediate port 16, seeFigs. 2, 3

and 6- A helical compression spring 17 assists the fluid under pressureenteringthe inlet'7, to urge the valve 4 against the seating bushing 5.The upper extremity of the valve 4has a semi-circular flange 42 the endsof which are adapted to engage a stop pin 50 to limit the rotarymovement of t-he valve 4 in either direction. The flange 42 besidesserving to limit the rotary movement of the valve 4, limits its downwardmovement by engaging the upper end of. the bushing 5. The valve 4 isfreely vertically removable from the bushing 5 being retained in normalposition by gravity.

The upper extremity of the valve 4 is also provided with alined notches41, the notch Ion one side of the valve being somewhat wider that thaton` the other side. 4A vertical valve actuating stem 14 mounted in a capwhich normally covers the bore 47, has a cross bar18 at its lower endwhich is formed to ft the notches 41 in one position only. The jointbetween the stem 14 and its supporting cap is sealed by means of` apacking 46, and the upper portion 45 of the stem 14 is flattened in sucha manner that the operating handle 9 can be applied in only oneposition.

During normal operation of the duplex strainer and assuming both of thestraining compartments to bein use, the valve operating handle 9 is setto point toward the liquid discharge pipe 8. The valve ports 21 are thenin communication with the passages 10, 11 and the ports 22 are incomn'uinication with the passages 12, 13. The impure liquid admittedunder pressure through the inlet pipe 7 is then free to flow through theupper valve chamber 19, valve ports 21, passages 10, 11 and the uppercompartments 27 through the screens 6 thus removing the solids from Thepurified liquid delivered ments 24 is discharged through the passages1-2, 13, valve ports 22, lower valve chamber 20 and the passage 23 tothe outlet pipe '8. During such operation of the apparatus, either steamor hot water may be supplied in regulated quantities to the jacket 30through the inlet pipe 31, the spent heating fluid being dischargedthrough the outlet pipe 32. The temperature of the liquid being treatedmay be determined by inserting a. thermometer through the opening 49,and the control of the temperature may be etfected by means of a valvein the inlet pipe 31. If upon starting the apparatus, or at any othertime. it is found that air has ac` cumulated in the casing 3, the airvent 44 may be opened thus permittin all of the air to escape by virtueof the act that .the

' the Valve 4 prevented Afrom entering vent 44 is disposed at thehighest` portion of the liquid chamber with which all other portionshave .free communication.

If it becomes desirable to shut down one of the filtering units, it isonly necessary to move the operating lever 9 in a direction away fromthe unit which is to be cut out, and over the cover 28 'of the unitwhich is to continue operating. As shown in Figs. 1 and 3, the unit athe left is lshut down and the unit at the ri tion. lVith the lever 9thus set,`one of' the upper side ports 21 of the valve 4 is in directopen communication with the passage 11 leading to the upper compartment27 ofthe operating ports 22 of the valve 4 is in direct .opencommunication with the discharge passage 23 and the valve port 16 is indirect open communication with the passage 13 leading to the lowercompartment y24 .of the operating unit.4 The liquid isthen free to flowthrough the operating units, but is positively the inoperative unitwhich is freelyaccessible by the cover 28 thereof. By swinging the valveoperating lever 9 in the opposite direction and over the unit at theleft of Figs. 1 and 3, the unit at the right is made inoperative and theleft unit is thrown into operation. When shutting down either of theunits by manipulation of` the lever 9, the-pin. 50 cngages an end of thevalve flange 42 and stops and the lever 9 when the desired position ofadjustment has been reached. If

it is desired to shut down both units, the

control valve normally provided in the feed pipe 7 may be closed in anobvious manner.

4By removing the covers 28, the screens 6 may be freely verticallyremoved; by removing the bearing cap for the valve stem 14, both thestem 14 and the valve 4 may be freely vertically removed; and by removinthe nuts 39, the inner casing 3 may be freely vertically removed fromwithin the outer casing 2. When the 'various' parts are assembled, thepackings 36, 37, 46 effectively seal the joints against leakage. Byproviding two separable casings 2, 3 to form the jacket 30, constructiondifiiculties arev reduced to a minimum since thenecessity of utilizingcomplicated cores during casting, is avoided.v All elements of thestructure are conveniently accessible for machining, and the use of theseating bushing 5 insures a perfect seat for the valve 4 regardless ofimperfections which may exist in the metal of the casing 3. Thestructure of the cross bar 18 of the stem 14, and-of the notches 41 ofthe valve 4, is such that these elements ing ght is in operatingposiunit; While one of the lower sideA removal of in firm engagementwith its'seat, thus assistthe unbalanced liquid pressure 'acting to seatthe valve 4 by virtue of the ports 15, 16.

The helical springs 38-serve to hold the screens 6 in proper positionwhen the covers 28 are closed, and the double concentric screens 6provide relatively large filtering area. The use of standard clamps 35,nuts 39, 40, and studs facilitates manufacture, andthe insulatingcovering33 effectively prevents undesirable radiation of heat.

' It Will thus be noted that the invention provides a simple, compactand efcient strainer of relatively great capacity wherein cleaning ofthe filtering screens may be readily effected Without interupting theoperation of the strainer. The apparatus is capable of being quicklyassembled and dismantled without special tools, and the parts can beasembled only in proper relation to each other. The distributing valvestructure is simple and effective and the apparatus is vespeciallyapplicable for the purification of oil.'

It should be understood that it is not desired to limit the invention tothe exact dctails of construction and operation herein shown anddescribed for various modifica-A tions within the scope of the claimsmay occur' to persons skilled in the art.

It is claimed and desired to Secure by Letters Patent v 1. Incombination, outer and inner casings `detachably associated to-form afluid jacket, fluid inlet and outlet connections communicating with saidjacket through said outer casing only, clamping means for detachablyconnecting said casings, said inner casing being removable from withinsaid outer c asing upon release of said clamping means Withoutdisturbing saidl connections, and Ma strainer located within said innercasing.

2. In combination, outer and inner casings detachably associated to forma. fluid jacket, a strainer located within said inner casino,

liquid supply and discharge connections.

communicating With said Astrainer -through said inner casing only, andclamping meansv for detachably connecting said casings, sai-d outercasing being removable from said inner casing upon release of saidclamping means Without disturbing said connections.

3. In combination, outer and inner casings detachably associated to forma fiuid jacket, iuid inlet. and outlet connections communicating withsaid jacket through said outer casing only, a strainer located withinsaid inner casing, liquid supply land discharge connectionscommunicating with said strainer through said inner casing only, and'clamping means for detachably connecting said casings, each of saidcasings` being removable from the otherupon release of said clampingmeans without disturbing the connections to said other casing.

vings :detachablyjassociatedalong plane sur` f .facesat theeufppfer,portions thereof` to form IaY-iiuidi jacket, fluid inlet and outlet.con-A ynections.communicating with said jacket ythrough saidV outercas-ing below saidsurf y =.-:faces,-liquidsupply afnd dischargeconnec-VK tions. communicating with .the Ainterior of said innercasing-above said surfaces, clamping means -for detachably.connectingsaid cas'ings at said surfaces, vand ay strainer locatedWithin saidinner casing.` Y

5. ln combination, outer and inner casings detachably associated alongplane'surfaces at the upper portions thereof to form. a fluid jacket,fluid inlet and outlet connectionsl communicating with said jacketthrough said outer casing only vbelow said surfaoes,liquid supply anddischarge connections communicating with the interior of' said innercasing above said surfaces, clamping means for detachably connectingsaid casings at said surfaces, a strainer located Within said innercasing, and means for effecting access to said strainer withoutdisturbing said clamping means and said connections.

(i. In' combination, outer and inner casings detachably associated onlyalong a horizontal joint at the upper portions of said casings to form afluid jacket, clamping means for detachably connecting said casings atsaid joint, a st 1lainer located Within said inner casing, fluid inletand outlet connections communicating with said jacket through said outercasing only beloW said joint, and liquid supply and dischargeconnections con'nnunicating with ksaid strainer through said innercasing only above said joint.

7. In combination, a casing, a strainer within said casing, a seatingbushing tiXedly positioned within said casing, a controlv valverotatable Within said bushing for regulating valve and with saidbushingto nrge the v former. againstv the. latter.

-8. In combination, a strainer, a seating bushing tixedly locatedadjacent. to said strainer, a rotary contro-l .valve operable Within andsupported by saidy bushing for regulating thelow ofliquid to and from'said strainer, and resilient-Ymeanscooperate -ing With said valveandwith said bushing to urge the former againstthe latter.

9. In combination, outer and..` inner casings detachably associated tol,form a fluid jacket, fluid inletand outlet connections communicatingwith said jacket through said outer casing only, clamping means fordetachably connecting said casings, said inner casing being removablefrom Within said outer casing upon release ofsaid clamping meansWit-hout disturbing said connections, a pair of strainers Wit-hinv saidinner casing, and means for ell'ecting independent ree mov-al of' saidstrainers without disturbing said clamping means.

10.A In combination, outer and inner casings ,deta-chably associatedtoforma liuid jacket, a pair of independently removable alternatelyoperable strainers Within said inner casing, liquid supply and dischargeconnections communicating With said strainers through said inner casingonly, and clamping means for detachably connecting said casngs saidoutericasing being removable from said inner casing upon release of saidclamping means Without disturbing said strainers or said connections.

inventor is axed hereto.

EUGENE M. SCOVILLE.

